Cinematographic projection apparatus



July 17, 1923.

L. FRASSIER CINEMATOGRAPHIC PROJECTION APPARATUS Filed Jan. 16, 1922 3 Sheets-Shut 1 %Le'on Ft assiefi orna yg.

July 11, 1923. 1,461,870

L. FRASSIER CINEMATOGRAPHIC PROJECTION APPARATUS Filed Jan. 16. 1922 3 Sheets-Shut 3 attor ans.

July 17, 1.923. 1,461,870

L. FRASSIER CINEMATOGRAPHIC PROJECTION APPARATUS Filed Jan. 16. 1922 3'Sheeta-Shut 3 Lon Prussia)" 0e rma a.

'by means of a single lantern with Patented July 17, 1923.

UNITED STATES riton EBA-S81E13, OF PARIS, FRANCE.

CINEMATOGRAPHIC PROJECTION APPARATUS.

Application filed January 16, 1922. Serial No. 529,725.

- new and useful Improvements in or Relating to Cinematogra hie Projection Apparatus, of which the fo owing is a specification.

In .cinemato a bio rejection, bobbins are actuall used w ich contain films of very considerab e length 300 m., 400 m. and more.

If only a single projection apparatus, that is, an apparatus consisting of the rojector proper and the lantern containing t esource of light, is used, it is necessary when the contents of a bobbin has been projected to the screen, to stop the rojection for a fairly considerable length 0 time, which is required for replac the empty ulpper supply bobbin, insertin t e film into 1'. e projector and wrapping t e film upon the lower receiving b0 bin.

In order to avoid any interruption of the projection, two complete projection apparatus can be used, that is two projectors and two lanterns, each projection apparatus being mounted upon a separate table, but in this case the cost of the installation is very considerable and the narrow space of the cubicle becomes very congested.

The improved projection apparatus forming the subjed'. of the present invention enables the bobbins containing films of considerable length to be projected successively its source of light and two projectors proper, the whole a paratus being mounted upon a single table w ich considerably reduces the congestion and also the initial cost of installation.

The improved arrangement comprises substantially a fixed plate inte al with or fixed to the table pro or upon w ich is rotatably mounted a circ ar plate or support carrying the motor and two complete rojectors arranged in staggered relation e the squares of a chess board which ma alternately-be brought within the axis of the single source of light by half a revolution of the circular su plort.

e result of this arrangement is that after the supply bobbin of the projector has been emptied, the second projector may be brought-.- exactly into the position previously occu ied by the first projector by giving the cir ar support half a turn, whereupon the Y second projector may be immediately started to continue the rojection. During the projectlon of the fi m the operator may remove the em ty bobbin from the first projector and su stitute a full bobbin. The second projector may thus be charged and prepared durmg the projection of the film contained in the first projector, so that it is quite ready to be substituted as soon as required.

The accompanying drawings show by way of example one construction embodying the features of the invention.

Fig. 1 is an elevation partly in section of the complete apparatus. F i 2 is a cros section, Fig. 3 is a plan, andiig. 4 shows a detail.

The complete projection apparatus com prises one single table which is provided with an arran ement for regulating the downward inclination of the table. The table comprises two longitudinal tubes 1, 1 upon which are adapted to slide the guides 2, 2 of the single lantern 3 containin the source of light. The tubes 1, 1 carry aiso a ring shap member 4 having an annular depression within which is disposed a platform or support 5 adapted to turn upon balls carried by the member 4. The platform or support 5 carries upon its upper surface two pro ectors 6, 6 WhlCh are arranged in staggered relation and symmetricall with regard to the centre of the member so t at they may be alternately placed within the optical axis of the lantern 3. The platform also carries arms 7, 7 upon which are mounted the casings 8, 8 of the supply bobbins of the projectors. The inside of the platform carries arms 9, 9 upon which are mounted the easings 10, 10 of the receiving bobbins, and a bracket 11, u on which is mounted an electric motor 12. he electric motor thus participates in the movement of the support 5.

The mechanism by which the movement of V the motor is transmitted to the two projectors will presentl be explained.

In order to avoi any accidental lifting of the support 5 any suitable device ma be used, for instance a number of flaps 13 xed to the plate 4 having projections overlapping the outer edge portion of the circular suport.

The platform or circular support ma be further provided with any suitable loc 'ng device by which it is automatically arrested in the re uired position after having been turned ha f a revolution. For this purpose two spring handles 14, l carried by the necte platform may be used each of which is provided with a projection which automatically takes into a hole 16 formed in the member 4 so as to lock the support in the re uired position.

he movement of the motor 12 is transmitted to the two rojectors by means of cords arranged in e manner particularly shown in Figs. 12.

The pulleys 17, keyed to the shaft of the motor 12 transmit the movement through cords 18 to loose pulleys 19 and 19 mounted upon the shafts 2Q, 20. Upon these shafts are mounted other pulleys 21 which may be coupled tothe pulleys 19, 19 by means of any suitable couplin device, for instance a device of the kind sgown in Fi 4. The pulleys 21 drive by means of cor 22, 22 other pulleys 23, 23 keyed upon the shafts 24, 24' which drive the mechanisms of the projectors 6 and 6 respectively.

The current is supplied to the motor 12 for instance by means of a double contact 25, carried by the member 4 and connected to the supply Wires, which contact 25 engages, according to the position occupied by the turn-table 5, with either of two pairs of sprin 26 carried by the table 5 and conby wires with the terminals of the motor 12.

In the position shown in the drawings, the projector 6 is in operation its axis of projection being exactly in line with that of the lantern. When the film contained in the bobbin enclosedin the casing 8 has been entirely projected, thepulley 21 of th projector 6 1s uncoupled and the platform 5 is given half a turn by means of the handle 14 whereby the pro ector 6 is placed into pro r working position. The upper casing of t is rojector has been previously charged with a bobbin containing a film during the projection of the film on the projector 6. When the platform has performed half a revolution the lock 15 carried by the handle 14 snaps into the hole 16 of themember 4 shaped support for said turn-table, two projectors disposed upon said turn-table in staggered relation and symmetricall with regard to the center-of the tum-tab c, said turn-table being rotatable to bring said projectors alternately with their axes of projection in alinement with the axis of projection of said source of light, a bracket depending from said turn-table and moving therewith, an electric motor supported by said bracket, an electric circuit to said motor for transmission of electric current thereto, operative connections between said motor and said projectors for selectively actuating the latter, and means for automatically closing said circuit when said turn-table has been moved to bring either one of said rojectors with its axis of projection in a 'n ment with the axis of projection of said source of light, and for breaking said circuit during the interval of rotation of said turn-table when neither one of said projectors is in position with respect to said source of light.

2. The apparatus described in claim 1, combined with means for automatically arresting movement of said turn-table when it has been moved to present either one of said projectors in proper position with respect to said source of light.

In testimony whereof I afiix my signature.

LEON FRASSIER. 

